ADU rules for Mount Vernon
Accessory Dwelling Unit (ADU) Rules for Mount Vernon, NY
Is your property eligible for an ADU?
# of Properties
10,376
Owner-occupied
65%
Zoning districts
21
Avg Home Value
$28
Median Lot Size
0.12 acres
Avg Income
$103,459
Residential Types:
10,376 housing units
2-3 Family
89%
Apts (4+ units)
7%
Other
4%
Zoning Districts:
11,185 parcels · 21 districts
RMF-6.75
28%(3,096)
R2-4.5
18%(1,962)
R1-4.5
12%(1,344)
RMF-10
11%(1,175)
Other
32%(3,608)
ADU Rules
What can you build in Mount Vernon, NY?
Mount Vernon, NY follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Not addressed in the local bylaw
- –Detached ADU: Not addressed in the local bylaw
Parking
- –No explicit ADU parking minimum or maximum; ADUs not listed in the Schedule of Off-Street Parking and Loading Space Requirements; case-by-case determination by the Commissioner of Planning under § 267-40.A
Rental Restrictions
- –Short-term rentals: 180-day cap for entire ADU; no cap if only a portion is rented with owner in residence. Must be occupied primary residence to operate; prohibited in certain locations (e.g., PILOT/rent-regulated buildings).
ADU State Law
What can you build in New York?
- –New York does not have a statewide ADU law; all ADU rules are set by individual municipalities.
- –ADUs may also be referenced as "accessory apartments" or "accessory living units," and definitions are not standardized statewide.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other New York municipalities
Rules change at the town line. Check the municipality your property is actually in.
Westchester County
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